Double pot holder for hanging on a flat rail



FIG. 1 is a perspective view from slightly above on the front right side of flower pot holder according to my design;

FIG. 2 is a left side view of my design;

FIG. 3 is a top view of my design;

FIG. 4 is a front view of my design;

FIG. 5 is a back view of my design; and,

FIG. 6 is a bottom view of my design. 

The ornamental design for a double pot holder for hanging on a flat rail, as shown and described. 